Precast retaining and crib walls are quick and
easy to construct with minimum labour. They have a multitude of
applications within civil engineering including ground retention in
road, rail, and landscape projects and watercourse management with
projects such as bunker walls, storm water tanks, cellars, below
ground parking, blast walls, and security walls.
Precast retaining walls can also be designed
to provide efficient and versatile bulk storage of materials on
either a temporary or permanent basis. Common materials stored
using retaining walls including coal, recycled materials,
fertilizers, sewage waste, sand and ceramics.
Many precast concrete suppliers offer a range
of simple cantilever walls, generally in a T or L profile. Standard
retaining wall elements are available in a range of widths, lengths
and thicknesses, with corner units to enable rapid
Standard elements are designed to retain
material with a density up to 16kN/m3 and an angle of repose
greater than 35º. With the retained material level with or below
the top of the wall elements, a superimposed load of up to 10kN/m2
can be applied to the fill on either or both wall faces.
Alternatively, material can be stored (or an embankment sloped) up
to an angle of 30º from the horizontal on either or both sides of
the element. Another solution is the use of double tee wall panels
connected to foundations via post-tensioning bars.
Inverted Y walls
Inverted Y-shaped walls are ideal for
free-standing retaining walls or for material storage and can also
be supplied ‘off the shelf’ together with corner elements.
Bespoke precast retaining wall elements can be
designed and manufactured to suit the needs of a project where
design requirements call for a solution that goes beyond anything
that can be achieved with standard elements.
Modular block systems are supplied by a number
of precast suppliers. These large blocks which interlock and build
up quickly into a retaining wall, are often designed to give the
appearance of natural rock.
Crib walls are constructed from interlocking
modular precast elements, infilled with different materials to suit
the aesthetic requirements of the site. The elements can be readily
demounted and reused elsewhere.